Generally speaking, there are two common forms of using imidacloprid: intermediate powder and gel bait.

The intermediate powder is mostly used in the agricultural field, with large quantities and wide coverage, but the insecticidal efficiency per unit volume is relatively limited.

After all, the efficiency of insecticide and cost are directly linked. The term "agricultural field" essentially refers to farmland or orchards, ranging from a few acres to hundreds or even thousands of acres.

If farmers were to purchase high-efficiency insecticides, their income wouldn't even cover the cost of the pesticides.

Apart from the intermediate powder, the imidacloprid commonly used in daily life is mostly gel bait, which is a high-specification, high-concentration polymer insecticide.

For example, Bayer's Maxforce, theoretically, 0.2 grams can kill more than fifty cockroaches.

If the third-generation imidacloprid is so effective, not to mention the fifth-generation imidacloprid that Xu Yun and his team have developed.

150 milliliters of water weighs 150 grams, and the density of the fifth-generation imidacloprid gel bait is much greater than that of water. The gel bait contained in two 150 milliliter syringes weighs about 700 grams, which is about seven ounces per syringe.

The amount of gel bait smeared on the wall...

You can imagine what that means.

More importantly, due to the geographical location of the University of Science and Technology in Luzhou city, the drainage system of the entire campus is inevitably distributed from the inside out.

Among them, Building 14 located on the edge of the East District, is a large outlet node that converges multiple sewage pipes from the campus, and the number of cockroaches around it is several times more than other areas...

Therefore, the severity of the situation is far greater than what Chang Licheng saw in the dormitory.

........

When Xu Yun arrived at Building 14, the area around the dormitory was already surrounded by a large number of onlookers from nearby dormitories, who had tacitly maintained a safe distance of thirty to forty meters from Building 14.

"Excuse me, I'm the teaching assistant of the Department of Applied Physics, thank you..."

Xu Yun struggled to squeeze out of the crowd. At this time, in the center of the field - that is, on the open ground outside the dormitory door, several dormitory managers and night patrol staff who had rushed over were standing.

Through their high-powered flashlights, a terrifying scene could be vaguely seen:

Students who have lived in dormitories should know.

Each dormitory building usually has three to five white drainage pipes, about fifteen centimeters in diameter, laid outside according to the scale of the building, mostly located between the walls of two dormitories.

At this moment, countless cockroaches were slowly climbing up the outer walls of these drainage pipes.

Then they turned left at the edge of the third floor, crawled through a window at the corner of a staircase, and entered the fourth floor...

The remaining part simply surged in from the main door on the first floor, rushing towards the fourth floor in droves.

Of course, where there is an entrance, there is an exit.

For example, some cockroaches had already been poisoned and were in a state of excitement, their wings spread high, fluttering out from the windows, followed by a large group of the same kind...

Under the night sky, the onlookers outside seemed to be Cao Cao's army, being blocked at Dangyang Bridge by the flying cockroaches.

Mixed in with this terrifying scene were the tightly closed doors and windows of the dormitories, and the occasional strange screams.

Seeing this situation.

Even the night patrol team of the University of Science and Technology, with more than ten years of security experience, were looking at each other, standing far away with their flashlights, looking blank and at a loss.

The dormitory manager, Sister Liu, was sharp-eyed and spotted Xu Yun, who had finally squeezed out of the crowd. Her face lit up with joy:

"Assistant Xu, you're here too? Come and see, what... what's going on?"

Xu Yun walked up to them with a wry smile on his face, looked up at the dense swarm of cockroaches:

"Sister Liu, how long has this been going on?"

Sister Liu was a somewhat plump middle-aged woman. She and her husband had been dormitory managers for more than ten years. She looked puzzled and scared:

"I don't know, I was cooking for the boys in Room 203, then I heard a strange scream, and then I saw a bunch of cockroaches rushing upstairs, it was terrifying..."

Cooking is prohibited in the dormitories of the University of Science and Technology, so some dormitory managers prepare some chicken offal and other small dishes on weekdays. If students want to drink some beer in the dormitory on weekends, they can order one or two dishes at a very affordable price, which is a small extra income for the dormitory managers.

Originally, Sister Liu was doing her private work. When she noticed something was wrong, she quickly turned off the stove and ran out with her husband.

Hearing this, Xu Yun couldn't help but sigh:

"Sister Liu, have you contacted the school leaders?"

"I just called a few counselors and leaders of the college party branch. Dean Tian is on his way..."

"Dean Tian? He hasn't gone to bed yet?"

"No, he said he was doing some experiment. When he heard the news, he told me he would be here soon and said there was no need to call the fire brigade..."

Hearing this, Xu Yun felt a sense of relief.

Throughout the entire University of Science and Technology, apart from a few members of Qiu Sheng's research group, the only one who could guess the inside story in a short time, apart from Xu Yun himself, was Tian Liangwei.

If it were other college leaders or even school leaders, who knows what kind of trouble they might cause.

Those with a stable mentality might be able to handle it calmly, but if they encounter some more emotional leaders, they might start to imagine it as an earthquake or even a demonization - after all, most schools are built on cemeteries, and many school leaders are superstitious.In virtually every school's top ten campus legends, there's always some connection to the supernatural.

Like this, about twenty minutes passed.

Tian Liangwei finally arrived at the scene with his assistant in a hurry.

Just as he parted the crowd and stepped outside the door, Tian Liangwei felt a chill run down his spine. Looking at the dense swarm of cockroaches, he even blurted out in his hometown dialect:

"Holy cow, so many cockroaches? Xu Yun, what on earth did you do?"

Xu Yun, who had been waiting there, sighed deeply and detailed the entire process, trying to shoulder as much of the blame as possible:

"...That's pretty much what happened, Director Tian. It's mainly my fault. I didn't explain the dosage to Li Cheng and the others..."

Tian Liangwei started off with a frown, but as he listened, his expression gradually became somewhat strange:

"Well, you can't take all the blame. It's really a problem of information gap. Those two probably searched the internet for agricultural insecticides and assumed that what you gave them would have the same effect...

Never mind, let's not talk about this now. Xu Yun, do you have any solutions?"

Xu Yun was silent for a moment before saying:

"Director Tian, the first thing we need to do is to stabilize the situation. I've already contacted the physics department leaders in the dormitory building, and all the dormitory doors and windows have been closed.

The students in the dormitories are mainly emotionally unstable, but other than that, they haven't been affected much. So, we need to put more effort into calming them down."

After a pause, he continued:

"As for the follow-up suggestions, my opinion is... wait!"

"Wait?"

Xu Yun nodded and said:

"After all, the dosage of the two tubes of bait is obviously excessive, but from the perspective of the coverage area, it's just so-so.

If nothing unexpected happens, it should have spread to the third generation of hosts by now, and it will stop after another two rounds.

So instead of intervening manually, we might as well just wait on the sidelines and spray some insecticides around to prevent the cockroaches from escaping.

However, the students in the dormitory will probably need psychological counseling. How about adding 0.2 to everyone's final grade point average? I guarantee they'll be jumping around happily tomorrow!"

Tian Liangwei's mouth twitched a few times:

"...You caused this mess, and you want the school to boost the GPA?"

Then he sighed:

"We'll talk about compensation later. Let's implement the plan you suggested. I'll explain to the college and the school. Good lord, I thought it was a biochemical crisis at first..."

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Meanwhile, as Xu Yun and the others were talking, the internet was gradually heating up...

......